Quotes from book
The Mentality of Apes

Name: The Mentality of Apes
Author: Wolfgang Köhler

The Mentality of Apes by Wolfgang Köhler is a landmark work in ethology, cognitive psychology and the study of the anthropoid apes. In it the author, a leading gestalt psychologist, showed that chimpanzees could solve problems by insight. The importance of this work was to show there is no absolute dividing line between the human species and their nearest living relative, at least in this respect. It was also a marker in the struggle between behaviourism and cognitive psychology which continued for the following half century. Köhler's observations and experiments were done on chimpanzees in captivity. Not until Jane Goodall's work later in the century was the behaviour of chimpanzees in the wild studied in depth.

“It is hardly an exaggeration to say that a chimpanzee kept in solitude is not a real chimpanzee at all.”

Wolfgang Köhler book The Mentality of Apes

Source: The Mentality of Apes, 1925, p. 293.

“For adult man with his mechanized methods of solution, proof is sometimes needed, as here, that an action was a real achievement, not something self-evident; that the breaking off a branch from a whole tree, for instance, is an achievement over and above the simple use of a stick, is shown at once by animals les”

Wolfgang Köhler book The Mentality of Apes

Source: The Mentality of Apes, 1925, p. 94; As cited in: Arthur Koestler, The Act of Creation, 1964, p. 103

“(17.2. 1914) Beyond some bars, out of arm's reach, lies an objective [a banana]; on this side, in the background of the experiment room, is placed a sawn-off castor-oil bush, whose branches can be easily broken off. It is impossible to squeeze the tree through the railings, on account of its awkward shape; besides, only one of the bigger apes could drag it as far as the bars. Sultan is let in, does not immediately see the objective, and, looking about him indifferently, sucks one of the branches of the tree. But, his attention having been drawn to the objective, he approaches the bars, glances outside, the next moment turns round, goes straight to the tree, seizes a thin slender branch, breaks it off with a sharp jerk, runs back to the bars, and attains the objective. From the turning round upon the tree up to the grasping of the fruit with the broken-off branch, is one single quick chain of action, without the least 'hiatus', and without the slightest movement that does not, objectively considered, fit into the solution described.”

Wolfgang Köhler book The Mentality of Apes

Source: The Mentality of Apes, 1925, p. 94; As cited in: Arthur Koestler, The Act of Creation, 1964, p. 103